我开发了这个小型多线程套接字服务器,它创建了一个不阻塞主程序的套接字,以及每个新接受连接的另一个线程。
当读取数据时出现问题,我有一个名为receiveData
的方法,它读取所有数据输入,所以现在代码只读取一次连接。
我通过在方法receiveData
内添加一个带有标志socket.CanRead
的while循环来解决这个问题,这个标志究竟做了什么? CanRead
和DataAvailable
之间有什么区别?
class Server
{
static void receiveData(TcpClient client, NetworkStream stream)
{
byte[] bytes = new byte[client.ReceiveBufferSize];
stream.Read (bytes, 0, (int) client.ReceiveBufferSize);
string returndata = Encoding.UTF8.GetString (bytes);
Console.WriteLine ("SERVER RECEIVED: " + returndata);
}
static void startServer()
{
new Thread(() =>
{
TcpListener listener = new TcpListener(IPAddress.Any, 5000);
listener.Start();
while (true)
{
if (listener.Pending()) {
new Thread(() =>
{
TcpClient client = listener.AcceptTcpClient();
NetworkStream stream = client.GetStream();
Server.receiveData(client, stream);
}).Start();
}
}
}).Start();
}
static void Main(string[] args)
{
Server.startServer ();
}
}
答案 0 :(得分:3)
请参阅MSDN NetworkStream.CanRead Property,
的CanRead:
获取一个值,该值指示NetworkStream是否支持读取。
而DataAvailable:
获取一个值,该值指示是否可以在NetworkStream上读取数据。
只有当NetworkStream支持读取时才会将输入数据指示为可用,因此可以读取。
看看示例代码,我认为它将回答您的所有问题:
// Examples for CanRead, Read, and DataAvailable.
// Check to see if this NetworkStream is readable.
if(myNetworkStream.CanRead){
byte[] myReadBuffer = new byte[1024];
StringBuilder myCompleteMessage = new StringBuilder();
int numberOfBytesRead = 0;
// Incoming message may be larger than the buffer size.
do{
numberOfBytesRead = myNetworkStream.Read(myReadBuffer, 0, myReadBuffer.Length);
myCompleteMessage.AppendFormat("{0}", Encoding.ASCII.GetString(myReadBuffer, 0, numberOfBytesRead));
}
while(myNetworkStream.DataAvailable);
// Print out the received message to the console.
Console.WriteLine("You received the following message : " +
myCompleteMessage);
}
else{
Console.WriteLine("Sorry. You cannot read from this NetworkStream.");
}
答案 1 :(得分:1)
根据MSDN文档NetworkStream.CanRead
Can Read MSDN用于确定网络流是否支持读取。 NetworkStream.DataAvailable
Data Acalible MSDN会向您显示是否有数据需要立即阅读。因此,您应该使用NetworkStream.CanRead
来确定它是否可读,并使用NetworkStream.DataAvailable
来确定是否有要阅读的内容。